<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>圣杯布局</title>
    <link rel="stylesheet" href="01.css">
  </head>
  <body>
    <div class="container">
      <!-- 主要内容放在前面个，是为了优先加载 -->
      <div class="main box">

      </div>
      <div class="left box">

      </div>
      <div class="right box">

      </div>

      <!-- <div style="clear: both;"></div> -->
    </div>
  </body>
</html>
